sf4 160,80 ldpc 2x3/8x4 seed=3, Eb/N0_dB, ngood, nundet, 10^6 trials
columns 2,3 decoder uses variable sigma, columns 4,5 decoder uses fixed sigma=0.9 
-0.5 2906 0  10862 5
0.0 18899 1  34663 6
0.5 78344 3  94319 3
1.0 220956 9 215720 9
1.5 447994 12 405922 9
2.0 694624 5 631688 5
2.5 876494 4 825223 2
3.0 965704 1 940486 1
3.5 993584 1 986229 1
4.0 999160 0 997916 0
4.5 999920 0 999792 0
5.0 999993 0 999982 0